Improvement in hot-air furnaces



UNITED STATE$ PATENT Orrron.

JOHN B. PIERCE, OF BUFFALO, NEW YORK.

IMPROVEMENT IN HOT-AIR FURNACES.

Specification forming part of Letters Patent No. 172,48 1, datedJanuarylS, 1876; application filed December 18, 1875.

To all whom it may concern:

Be it known that 1, JOHN B. PIERCE, of the city of Bufl'alo, in thecounty of Erie and State of New York, have invented certain new anduseful Improvements in Hot-Air Furnaces, which improvements are fullyset forth in the following specification, reference being had to theaccompanying drawings.

This invention consists in the combination of two annulardrum-radiators, arranged so that the heat and products of combustion, asthey issue from the furnace, may be made (by closing a damper in thepipe) to pass inside of the upper radiator, around the domeot' thefurnace, thence downward and inside of the lower radiator, around thefire-box of the furnace, and from thence to the chimney; or, by openingthe damper in the pipe, it may be allowed to pass directly fromthefurnace,through the same, to the chimney.

My invention further consists in the combination of one or moreremovable annular radiators with the furnace, arranged so that one orboth may be readily taken off and the furnace used either alone or withone or all of said radiators; also, in the arrangement of a devicewithin the radiators, for affording a convenient means for cleaningthem, as will be more clearly hereinafter shown.

In said drawings, Figure 1 is a side elevation of my invention complete;Fig. 2, a vertical longitudinal section through the center of the same.Fig. 3 is a top or plan view; and Fig. 4 represents a side elevation,showing the combination of a single radiator with the furnace, also afragment of one of the radiators in section, showing the arrangement ofa valve inside to allow for cleaning.

A is the furnace; B, the upper, and O the lower, radiator. D representsthe furnacedoor. E is a door leading to the ash-pit. F, in Fig. 2, isthe fire-box, and G the grate.

'Ihere is a partition, b, in both radiators, a

valve, 0, being arranged in the lower one to allow for cleaning. A sideview of said valve is shown in sectional fragment below Fig. 4. d is aweight for holding the valve down. H H represent openings havingremovable covers, through which the inside of the radiators may bereleased and cleaned when necessary.

The operation of the furnace is as follows: When the damper L in thepipe is closed, the products of combustion move, in the direction of thearrows N, into the pipe, thence up into radiator B, through the pipe P,on one side of the partition, thence around and down through the pipe J,on the other side of the partition, into the radiator O, on one side ofthe valve and partition 0 b, then around it and down through the pipe K,and from thence to the chimney, thereby carrying the products ofcombustion through the upper radiator, around the upper part or dome ofthe furnace, and, through the lower radiator, around the outside of thefirebox.

By opening the damper L, as will be readily seen, the heat and gasespass directly from the furnace, through the pipes, to the chimney.

In cleaning the radiators, a scraper is introduced through the openingH, and the ashes or dust are pushed around from both sides (in the upperradiator) toward the pipeopenings J and P, part falling into theradiator G, and part into the pipe Q, from which it may be easilyremoved by taking off the cover at the end.

The lower radiator is cleaned by introducing the scraper through theopening 1H and pushing the soot and ashes under the valve 0, into theopening Kon one side, and directly into the said opening from the otherside. The valve 0 closes as soon as the scraper is removed.

By taking the smoke-pipe off, which comes apart in the usual way, one ofthe said radiators may be easily lifted from its place.

1 claim as my invention--- l. The combination, substantially asspecified, of the hotair furnace and two connected radiators,respectively arranged above and below the smokeexit of the furnace, thegases escaping from such smoke-exit passing into the upper radiator,through which they circulate, and from which they are conducted into thelower radiator at one end, to escape into a branch smoke-exit at theother end.

2. The radiators B 0, provided with the partitions b and valve 0,combined with the pipes J and P, and made removable, substantially asand for the purposes described.

3. The radiator 0, provided with a partition, I), and a gravitatingweighted valve, 0, in combination with the hot-air furnace A, allarranged substantially as and for the purposes described.

Witnesses: JOHN B. PIERCE.

JAMES SANGSTER, F. P. STIKER.

